/*
*author: XYB
**使用方法
*		1：注册路由 : spaRouters.map('/name',function(transition){
						//异步加载js
						spaRouters.asyncFun('name.js',transition)
						//或者同步执行回调
						spaRouters.syncFun(function(transition){},transition)
					})
		2：初始化      spaRouters.init()
		3：跳转  href = '#/name'
*/
(function() {
    var util = {
        //获取路由的路径和详细参数
        getParamsUrl:function(){
            var hashDeatail = location.hash.split("?"),
                hashName = hashDeatail[0].split("#")[1],//路由地址
                params = hashDeatail[1] ? hashDeatail[1].split("&") : [],//参数内容
                query = {};
            for(var i = 0;i<params.length ; i++){
                var item = params[i].split("=");
                query[item[0]] = item[1]
            }
            return 	{
                path:hashName,
                query:query
            }
        }
    }
    function spaRouters(){
        this.routers = {};//保存注册的所有路由
        this.beforeFun = null;//切换前
        this.afterFun = null;
    }
    spaRouters.prototype={
        init:function(){
            var self = this;
            //页面加载匹配路由
            window.addEventListener('load',function(){
                self.urlChange()
            })
            //路由切换
            window.addEventListener('hashchange',function(){
                self.urlChange()
            })
            //异步引入js通过回调传递参数
            window.SPA_RESOLVE_INIT = null;
        },
        refresh:function(currentHash){
            var self = this;
            if(self.beforeFun){
                self.beforeFun({
                    to:{
                        path:currentHash.path,
                        query:currentHash.query
                    },
                    next:function(){
                        self.routers[currentHash.path].callback.call(self,currentHash)
                    }
                })
            }else{
                self.routers[currentHash.path].callback.call(self,currentHash)
            }
        },
        //路由处理
        urlChange:function(){
            var currentHash = util.getParamsUrl();
            if(this.routers[currentHash.path]){
                this.refresh(currentHash)
            }else{
                //不存在的地址重定向到首页
                location.hash = '/index'
            }
        },
        //单层路由注册
        map:function(path,callback){
            path = path.replace(/\s*/g,"");//过滤空格
            if(callback && Object.prototype.toString.call(callback) === '[object Function]' ){
                this.routers[path] ={
                    callback:callback,//回调
                    fn:null //存储异步文件状态
                }
            }else{
                console.trace('注册'+path+'地址需要提供正确的的注册回调')
            }
        },
        //切换之前一些处理
        beforeEach:function(callback){
            if(Object.prototype.toString.call(callback) === '[object Function]'){
                this.beforeFun = callback;
            }else{
                console.trace('路由切换前钩子函数不正确')
            }
        },
        //切换成功之后
        afterEach:function(callback){
            if(Object.prototype.toString.call(callback) === '[object Function]'){
                this.afterFun = callback;
            }else{
                console.trace('路由切换后回调函数不正确')
            }
        },
        //路由异步懒加载js文件
        asyncFun:function(file,transition){
            var self = this;
            if(self.routers[transition.path].fn){
                self.afterFun && self.afterFun(transition)
                self.routers[transition.path].fn(transition)
            }else{
                console.log("开始异步下载js文件"+file)
                var _body= document.getElementsByTagName('body')[0];
                var scriptEle= document.createElement('script');
                scriptEle.type= 'text/javascript';
                scriptEle.src= file;
                scriptEle.async = true;
                SPA_RESOLVE_INIT = null;
                scriptEle.onload= function(){
                    console.log('下载'+file+'完成')
                    self.afterFun && self.afterFun(transition)
                    self.routers[transition.path].fn = SPA_RESOLVE_INIT;
                    self.routers[transition.path].fn(transition)
                }
                _body.appendChild(scriptEle);
            }
        },
        //同步操作
        syncFun:function(callback,transition){
            this.afterFun && this.afterFun(transition)
            callback && callback(transition)
        }

    }
    //注册到window全局
    window.spaRouters = new spaRouters();
})()